Why would a sprinkler system stop working?
A sprinkler system can stop working for many reasons. Most of the time it’s something very simple like the irrigation controller is turned off or has lost its programming due to a power loss or surge.
If you find that the irrigation controller isn’t the culprit, check the city water meter to make sure you have a water supply to the backflow preventer, that the backflow preventer valve handle is set to open and that there’s no standing water in the lawn.
List of other faults to check:
-irrigation controller faulty
-master valve faulty or no voltage
-zone valve faulty or no voltage
-valve control wires broken or cut
-broken irrigation pipe
-sprinkler head clogged or broken
-drip line clogged or cut